import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.WebContext;
import org.thymeleaf.templateresolver.ServletContextTemplateResolver;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Random;

@WebServlet("/guessNum")
public class GuessNumServlet extends HttpServlet {
    private TemplateEngine engine=new TemplateEngine();
    private Random random=new Random();
    private int count=0;
    private int toGuess=0;

    @Override
    public void init() throws ServletException {
        ServletContextTemplateResolver resolver=new ServletContextTemplateResolver(this.getServletContext());
        resolver.setPrefix("/WEB-INF/template/");
        resolver.setSuffix(".html");
        resolver.setCharacterEncoding("utf-8");
        engine.setTemplateResolver(resolver);
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html; charset=utf-8");
        toGuess=random.nextInt(100)+1;
        count=0;
        WebContext webContext=new WebContext(req,resp,getServletContext());
        webContext.setVariable("newGame",true);
        engine.process("guessNum",webContext,resp.getWriter());
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html; charset=utf-8");
        String parameter= req.getParameter("num");
        int num=Integer.parseInt(parameter);
        String result="";
        if (num<toGuess){
            count++;
            result="猜小了";
        }else if (num>toGuess){
            count++;
            result="猜大了";
        }else {
            count++;
            result="恭喜你，猜正确";
        }
        WebContext webContext=new WebContext(req,resp,getServletContext());
        webContext.setVariable("guessNum",false);
        webContext.setVariable("result",result);
        webContext.setVariable("count",count);
        engine.process("guessNum",webContext,resp.getWriter());

    }
}
